/*
 * Copyright © 2011-2015 the spray project <http://spray.io>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package spray.http
package parser

import org.parboiled.scala._
import BasicRules._

private[parser] trait AcceptCharsetHeader {
  this: Parser with ProtocolParameterRules with CommonActions ⇒

  def `*Accept-Charset` = rule(
    oneOrMore(CharsetRangeDecl, separator = ListSep) ~ EOI ~~> (HttpHeaders.`Accept-Charset`(_)))

  def CharsetRangeDecl = rule {
    CharsetRangeDef ~ optional(CharsetQuality) ~~> { (range, optQ) ⇒
      optQ match {
        case None    ⇒ range
        case Some(q) ⇒ range withQValue q
      }
    }
  }

  def CharsetRangeDef = rule("*" ~ push(HttpCharsetRange.`*`) | Charset ~~> (s ⇒ HttpCharsetRange(getCharset(s))))

  def CharsetQuality = rule(";" ~ "q" ~ "=" ~ QValue)
}